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The forward-backward charge asymmetry (AFB) at hadron colliders is sensitiveto both the electroweak (EW) symmetry breaking represented by the effectiveweak mixing angle, and the proton structure information in the initial statemodeled by the parton distribution functions (PDFs). Due to their strongcorrelation, the precisions of the determination on the weak mixing angle andPDFs using the measured AFB spectrum are limited. In this paper, we define aset of structure parameters which factorize the unique proton information ofthe relative difference between quarks and antiquarks in the AFB observation.Other than the conventional way of extracting the weak mixing angle fro theconvolution of PDF and EW calculations, we propose a new method tosimultaneously determine the value of the weak mixing angle and the protonstructure terms by fitting to the observed AFB distribution, and point out thenecessity of specifying additional observations to further reduce theuncertainties on the proton structure terms respectively, so that themodel-independent high precision measurements can be achieved at the future LHCexperiments.

Factorization of the forward-backward charge asymmetry and measurements of the weak mixing angle and proton structure at hadron colliders